Temper screw clamp



March 18 1924'. 1,487,687

J. F. HARRISON TEMPER scmsw CLAMP Filed May '7, 1923 E gwuento'o Jirz 22%7773'0/2 attozwaq Patented Mar. 18, 1924.

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JOHN F. HARRISON, or COLUMBUS, MONTANA, AssreNor. T0 HABRISO OLANP cora- PAZNY, or CASPER, WYOMING,

A CORPORATION OF WYOMING.

rmrrnascnnw oLAMrf Application filed May 7,

To all whom it may concern:

Be it known that 1, JOHN F. HARRISON, a citizen of the United States, residing at C0- lumbus, in the county of Stillwater and State of Montana, have invented certain new and useful Improvements in Temper Screw Clamps; and I do hereby declare that the following is a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in clamps, and particularly to temper screw clamps used in well drilling.

One object of the invention is to provide a clamping device, used in connection with the rope gripping jaws, whereby the jaws may be easily and quickly thrown into and out of gripping position, and wherein the jaws will be firmly held in gripping engagement with a rope without danger of being accidentally disengaged.

Another object 1s to provide a device of this character which is capable of adjustment so that the jaws may grip ropes of different diameters.

Other objects and advantages will be apparent from the following description when taken in connection with the accompanying drawing.

In the drawing:

Figure 1 is a top plan view of a temper screw clamp equipped with the clamping and locking means of the present application.

Figure 2 is a side elevation of the same.

Figure 3 is a side elevation viewed from the opposite side to that of Figure 2.

Referring particularly to the accompanying drawing, 10 and 11 represent a pair of members which are hinged at one end, as shown at 12. The inner face of the pivotal portion of each member 10 and 11 is formed with a longitudinal channel 13, in which is seated the slip 14, said slip being secured within the channel by means of the screws 15. The upper end of each of the slips is formed with an outwardly turned portion 16 which rests on the upper face of a member 10 or 11. Each of the members 10 and 11 has a hook 17 with which is engaged a ring The outer end of the member 10 is formed with a longitudinal central open-ended slot' 19, and formed on the outer face of the member, at each side of the slot, is an apertured 1923. Serial No. 637,384.

mates??? car '20-. Pivotally mounted between-these ears'2O 1s the bifurcated 'camhead'21 "of the locking-lever 22, which is-arr'anged' to play through the slot, in pthe" operation thereof. Pivotally mounted in the bifurcation of the head 21 is one end of the pressure screw 23, the same extending through the slot 19 and through the open-ended slot 24,- of the corresponding end of the member 11. A head, 25 having radial arms 26, is screwed on the outer end of the screw 23, and is formed with a conical inner face 27 arranged to seat in a conical socket 28, formedin the walls of the open-ended slot 24. A jam-nut 29 is arranged on the outer end of the screw 23, outwardly of the head 25, to maintain the head against movement from itsadjusted position. The screw 23 is arranged to be swung into and out of the slot 24, as will be readily understood from the drawing, to release or engage the slips 14 with the'rope 30. Connected at one end to the lever 22, adjacent the cam head 21, and at its other end to the inner or pivotal end of the member 10, is a coil spring 31, which normally urges the lever into position longitudinally outwardly of the member 10, so that the pressure screw 23 will be drawn into engagement with the member 11, and said member moved toward the member 10. To insure'that the lever will remain in such position, and against accidental jarring therefrom, a chain 32 is secured to the side of the member 10 and is arranged to be drawn across the lever and engaged with a hook 33, carried by said member at the other side of the lever.

When the lever is swung into releasing position, as shown in Figure 4, it will be noted that the spring 31 moves into the bifurcation of the cam head 21, thus permitting said lever to be moved to its full limit, and cause the members 10 and 11 to separate to. the

proper degree for releasing the rope from the 1. A temper screw clamp including movably connected members having rope gripping means at their connected portions, a lever movably mounted in the other end of one of the members, and a clamping means movably carried by the lever and adjustably engaged throughthe other member and releasable therefrom.

2. A temper screw clamp including movably connected members having rope gripping means at their connected ends, the other end of each of the members being formed with open ended slots, a cam lever pivotally mounted in one of the said slots, and a pressure screw movably carried by the lever and releasably engaged with the other slot.

3. A temper screw clamp including mov ably connected members each having its outer end longitudinally slotted, a lever havin}; a bifurcated cam head pivotally mounted for movement in one of said slots, a pressure screw pivotally mounted in the bifurcation of the cam head, an adjustable head on the pressure screw and engageable in the slot of the other member, and a spring between the cam head and the attached member.

In testimony whereof, I aflix my signature in the presence of two witnesses.

JOHN F. HARRISON. Witnesses MILDRED E. J OHNS, S. W. NICHOLAS. 

